Stuck between zones with the loading screen? you can close out the game and restart and it will spawn you back in the previous zone (or if your already loaded just stuck on loading screen it will spawn you in the zone you loaded), then re-enter and you should be alright.

If your stuck inside the map with a horrible mass of players at the spawn point, use /unstuck and you should be freed from the mass.

Personally, on the later issue i hope they create a few extra spawn nodes (Player_Start), to prevent that issue or convert a Box in Unreal to a script for zone player spawn.